Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/9f6a7686bb24
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #16433 from jrburke/bug940132-email-drawer

Bug 940132 - [email] change drawers to slide down r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/b67d30b1994b
Author: jrburke <jrburke@gmail.com>
Desc: Bug 940132 - [email] change drawers to slide down
Bumping manifests a=b2g-bump